Uploading HiC track on UCSC browser

Question

[arsala521]

Hi,

I have a .hic file (not generated by myself. It is from NBI GEO: https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE128800). I want to upload and visualize this data/file (GSM3685694_chimpanzee_panTro5_mapping.hic) on UCSC browser. I am trying to follow these steps mentioned on UCSC web (copied below):

The typical workflow for generating a hic custom track is this:

1. Prepare your data by processing it with the Juicer pipeline to create a file in the hic format.
2. Move the hic file (my.hic) to an http, https, or ftp location.
3. Construct a custom track using a single track line. The basic version of the track line will look something like this: track type=hic name="My HIC" bigDataUrl=http://myorg.edu/mylab/my.hic
4. Paste the custom track line into the text box in the custom track management page, click "submit" and view in the Genome Browser.

As I already have a .hic file uploaded on https location (https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE128800), I assume I will start from step 3. I want to ask how should I modify bigDataUrl for my case. I tried (bigDataUrl=https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE128800/GSM3685694_chimpanzee_panTro5_mapping.hic) but it didn't work.

Second, on the 'add custom track' page, there are two text boxes (one is "Paste URLs or data:" and second is "Optional track documentation:" . For the step 4, which text box should I use to paste the custom track line.

Thank you

Answer 1

[Pierre Lindenbaum]

bigDataUrl=https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE128800/GSM3685694_chimpanzee_panTro5_mapping.hic

 wget -O - -q "https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE128800/GSM3685694_chimpanzee_panTro5_mapping.hic" | file -
/dev/stdin: HTML document, ASCII text, with very long lines (557)

this url links to a web page, not to the acual file.

I think you want : https://www.ncbi.nlm.nih.gov/geo/download/?acc=GSM3685696&format=file&file=GSM3685696%5Fgorilla%5FgorGor4%5Fmapping%2Ehic

Furthermore, the server hosting the data must accept Range-Request data : https://en.wikipedia.org/wiki/Byte_serving . I don't think the NCBI can be used as a file provider (but may be I'm wrong).

EDIT:

and the answer is 'no'. If I only want the bytes 2-10 from your file, the range-request is ignored.

$ curl -r 2-10 -s  "https://www.ncbi.nlm.nih.gov/geo/download/?acc=GSM3685696&format=file&file=GSM3685696%5Fgorilla%5FgorGor4%5Fmapping%2Ehic" | hexdump -C | head
00000000  48 49 43 00 08 00 00 00  e3 11 a0 66 00 00 00 00  |HIC........f....|
00000010  68 67 33 38 00 01 00 00  00 73 6f 66 74 77 61 72  |hg38.....softwar|
00000020  65 00 4a 75 69 63 65 72  20 54 6f 6f 6c 73 20 56  |e.Juicer Tools V|
00000030  65 72 73 69 6f 6e 20 31  2e 37 2e 36 00 1a 00 00  |ersion 1.7.6....|
00000040  00 41 4c 4c 00 9e 1f 2f  00 4d 00 b9 40 00 00 31  |.ALL.../.M..@..1|
00000050  00 06 c6 d6 0e 32 00 79  94 6f 0e 33 00 07 c0 d1  |.....2.y.o.3....|
00000060  0b 34 00 9b 71 56 0b 35  00 d3 0d d2 0a 36 00 db  |.4..qV.5.....6..|
00000070  4a 2e 0a 37 00 35 6d 7f  09 38 00 cc a3 a6 08 39  |J..7.5m..8.....9|
00000080  00 5d bc 3f 08 31 30 00  2e 96 f9 07 31 31 00 1e  |.].?.10.....11..|
00000090  42 0d 08 31 32 00 ad 9e  f1 07 31 33 00 a8 0f d1  |B..12.....13....|

so you need to find a server to host your data.

a range request that works (ucsc)

$ curl -r 2-10 -s  "http://hgdownload.soe.ucsc.edu/gbdb/hg19/bbi/hic/GSE63525_HMEC_combined.hic" | hexdump -C | head
00000000  43 00 08 00 00 00 59 81  3c                       |C.....Y.<|
00000009

[arsala521]

Thank you so much for a detailed response. I am new to uploading custom tracks (particularly hic tracks) on UCSC browser. What I understand from the answer is I can't use the NCBI web server and I need to upload this .hic file o github or some webserver. If you can please elaborate the 'range request' part a little more. Thank you again,

[Pierre Lindenbaum]

range request are not available on all servers. Why is it needed ? then UCSC will NOT download/store the whole file each time you want to display the data. It just extracts the data from the file where(chrom-start-end) the information is known to be found (this is how tools like tabix work with remote files )

[arsala521]

I got the range request concept. Thank you so much. I read on a forum that google drive can be used for this purpose. Now I uploaded this hic file on google drive and used the track line as: track type=hic name="My HIC" bigDataUrl=[google drive link]. The browser is now giving the error that "Hi-C magic string is missing, does not appear to be a hic file". I am able to upload this file on Juicebox. I hope I am using the right link. After uploading this file on google drive, I right clicked the file and from the share drop down menu I clicked on copy link to get the link.